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UV-visible absorption titration of W (25 μM) with Me-β-CD at pH 3 (A), and pH 9 (B); the inset shows the corresponding titration curve and the 1:1 binding fit (solid line) with K = (2.9 ± 0.3) × 103 M‒1, and K = (4.2 ± 1.0) × 102 M‒1, respectively.
